Existing buildings (IEBC): repair and alteration levels 1, 2, and 3

One-line orientation

The International Existing Building Code (IEBC) increases required upgrades as the work becomes more extensive. Its work-area method moves from Repair through Alteration Levels 1, 2, and 3; Level 3 begins when the work area exceeds 50% of the building area.

Key points

• Repair — restores worn or damaged components to their original condition with similar materials (patching). No change to how the space is used; the lightest scope.
• Level 1 alteration — replaces or covers existing materials without changing space usability: new finishes, new equipment, new fixtures. Surfaces and components change; the layout does not.
• Level 2 alteration — reconfigures the space layout or systems: adding or removing an element, installing or extending a new system. Goes beyond surfaces into how the space is arranged.
• Level 3 alteration — work area exceeds 50% of the building area; entails significant reconfiguration that may affect structural elements and triggers broader, building-wide upgrades.
• Each rung is cumulative — higher levels carry the obligations of the lower ones plus more, so classifying the work correctly sets which requirements apply.
• The IEBC also offers compliance methods (e.g., prescriptive, work-area, performance); the level framework above is the work-area method.

IEBC: repair → alteration levels scale to the scope of work

Requirements scale to scope: repair, then Level 1 finishes, Level 2 reconfiguration, Level 3 the most.

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Cumulative — each level also carries every requirement below it (IEBC work-area method). §505.1 is the code section that defines a Level 3 alteration, and it is what draws the Level 2 / Level 3 line.

Confusions / comparison

Level	Scope of work	Layout changed?	What it adds
Repair	Like-for-like fix, patching	No	Restore to original, similar materials
Level 1	Replace/cover finishes, new fixtures/equipment	No	Surface & component replacement
Level 2	Reconfigure space or systems	Yes	Add/remove elements, extend systems
Level 3	Work area > 50% of building	Yes (extensive)	Structural impact, broad upgrades

Related

→ Occupancy groups overview (this module): a change of occupancy is its own IEBC trigger beyond the alteration levels · Means of egress parts (this module): egress upgrades are a common Level 2/3 trigger · Fire-resistance ratings (this module): existing-building upgrades often hinge on rated assemblies.